next(1,2).
next(2,3).
next(3,4).
next(4,5).
next(5,6).
next(6,7).
next(7,8).
next(8,9).
next(9,10).
next(10,11).
next(11,12).
next(12,13).
next(13,14).
next(14,15).
next(15,16).
next(16,17).
next(17,18).
next(18,19).
next(19,20).
next(17,21).
next(21,22).
next(22,23).
next(15,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(33,34).
next(31,35).
next(35,36).
next(36,37).
next(29,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(42,43).
next(40,44).
next(44,45).
next(45,46).
next(28,47).
next(47,48).
next(48,49).
next(49,50).
next(50,51).
next(48,52).
next(52,53).
next(53,54).
next(14,55).
next(55,56).
next(56,57).
next(57,58).
next(58,59).
next(59,60).
next(60,61).
next(61,62).
next(59,63).
next(63,64).
next(64,65).
doAt(startflow,7).
doAt(a2,8).
doAt(a16,10).
doAt(a9,11).
doAt(a1,13).
doAt(a5,14).
doAt(a13,15).
doAt(a10,16).
doAt(a6,17).
doAt(a14,18).
doAt(endflow,19).
doAt(a8,21).
doAt(endflow,22).
doAt(a19,24).
doAt(a3,25).
doAt(a7,26).
doAt(a4,27).
doAt(a15,28).
doAt(a17,29).
doAt(a24,30).
doAt(a6,31).
doAt(a14,32).
doAt(endflow,33).
doAt(a8,35).
doAt(endflow,36).
doAt(a20,38).
doAt(a18,39).
doAt(a6,40).
doAt(a14,41).
doAt(endflow,42).
doAt(a8,44).
doAt(endflow,45).
doAt(a22,47).
doAt(a6,48).
doAt(a14,49).
doAt(endflow,50).
doAt(a8,52).
doAt(endflow,53).
doAt(a23,55).
doAt(a11,56).
doAt(a21,57).
doAt(a25,58).
doAt(a6,59).
doAt(a14,60).
doAt(endflow,61).
doAt(a8,63).
doAt(endflow,64).
compAt(a9,x17,9).
compAt(a1,x13,12).
leftrightnexts(18,21).
leftrightnexts(32,35).
leftrightnexts(41,44).
leftrightnexts(30,38).
leftrightnexts(49,52).
leftrightnexts(29,47).
leftrightnexts(16,24).
leftrightnexts(60,63).
leftrightnexts(15,55).